Approximating Differential Quantities by Differences

Approximating Differential Quantities by Differences

The cp of ideal gases depends on temperature only, and it is expressed as cp(T) = dh()/dT. Determine the cp of air at 300 K, using the enthalpy data from Table A–17, and compare it to the value listed in Table A–2b.

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FIGURE 12–2

Table A-17

T, K s°, kJ/kg • K
. .
. .
. .
300 1.70203
310 1.73498
320 1.76690
. .
. .
. .

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